Bolesław IV the Curly
| Bolesław IV the Curly | |
|---|---|
| High Duke of Poland | |
| Reign | 1146–1173 |
| Predecessor | Władysław II the Exile |
| Successor | Mieszko III the Old |
| Born | c. 1122 |
| Died | 5 January 1173 (aged 51) |
| Spouses | Viacheslava of Novgorod Maria |
| Issue | Leszek, Duke of Masovia |
| House | Piast dynasty |
| Father | Bolesław III Wrymouth |
| Mother | Salomea of Berg |
Bolesław IV the Curly (Polish: Bolesław Kędzierzawy; c. 1122 – 5 January 1173), a member of the Piast dynasty, was Duke of Masovia from 1138 and High Duke of Poland from 1146 until his death in 1173.